This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A055683 #19 Apr 03 2022 01:30:02
%S A055683 15,756,48979,3612920,286272005
%N A055683 Number of Gaussian primes (in the first half-quadrant; i.e., 0 to 45 degrees) with real part < 10^n.
%D A055683 Mark A. Herkommer, "Number Theory, A Programmer's Guide," McGraw-Hill, New York, 1999, page 269.
%H A055683 <a href="/index/Ga#gaussians">Index entries for Gaussian integers and primes</a>
%H A055683 <a href="/index/Pri#primepop">Index entries for sequences related to numbers of primes in various ranges</a>
%t A055683 c=0; Do[ If[ PrimeQ[ j + k*I, GaussianIntegers -> True], c++ ], {j, 0, 10^n-1}, {k, 0, j} ]; c
%K A055683 nonn,more
%O A055683 1,1
%A A055683 _Robert G. Wilson v_, Jun 09 2000
%E A055683 Name corrected by _Sean A. Irvine_, Apr 02 2022